When imitation requires companies to make changes to their whole system of activities, or ganizational politics may impede a would-be competitor's ability to switch to the divergent business model of a blue ocean strategy. For instance, airlines trying to follow Southwest's example of offering the speed of air travel with the flexibility and cost of driving would have faced major revisions in routing, training, marketing, and pricing, not to mention culture. Few established airlines had the flexibility to make such extensive organizational and operating changes overnight. Imitating a whole system approach is not an easy feat.